We stock Siemens SIMATIC S7-400. This modular PLC system is intended larger applications. In addition to digital I/O modules, the S7-400 system also offers analog I/O modules, modules for temperature measurement and temperature control, counters, positioning modules and more. Even though the Siemens SIMATIC S7-400 still is in the active phase, many of the older modules have been phased out. We can offer used/refurbished Siemens SIMATIC S7-400 spare parts from our stock.